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I have discovered that trying to programmatically set the check status of a disabled radio button causes the program to hang. This is because the implementation of the CExtRadioButton does not take into consideration the fact that GetNextDlgGroupItem skips disabled controls. This means that when starting with a disabled control and looping through the group you never reach the starting control again and so the loop never exits.

Regards,
Grant

Dear Grant,

Thank you for the bug information. Please modify the CExtRadioButton::_UncheckRadioButtonsInGroup method in this way:

void CExtRadioButton::_UncheckRadioButtonsInGroup()
{
   ASSERT_VALID (this);
CWnd* pWndParent = GetParent();
   if (pWndParent == NULL)
                  return;
   ASSERT_VALID( pWndParent );
CWnd *pWnd = pWndParent->GetNextDlgGroupItem( this );
   if( !this->IsWindowEnabled() ) return; //INSERT THIS LINE!!!
   while( pWnd != this && pWnd != NULL )
   {
   ...